Electric-light socket.



FRANZ FRANKOFSKI, OF NORTH BRADDO(K, PENNSYLVANIA.

ELECTRIC-LIGHT SOCKET.

Application led September l2, 1907. Serial No. 392,444.

To all wlwm 'Lt ymay concern:

Be 1t known that l, FRANZ FnANKoPsKI, a

vsubject of'the King of Hungary, residing at North: Braddock, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Electric-Light Sockets, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to incandescent electric lamps, and its object is to prevent the removal of the glass bulb containing the lilament from its socket without. breaking. the bulb. f

As is well known the ordinary bulb is provided with a screw-threaded sleeve or band which iit's internal threads of the lamp socket so that the bulb may bevreadily removed from the socket by unscrewing it, and unauthorized persons can easily detach the bulbs. The present invention aims to prevent the theft of the filament bulbs, by securing them in the sockets in such a manner as to render it impossible to disengage them from their sockets without breaking the glass bulbs.

The construction of the improvement will be fully described hereinafter, in connection with the accompanying drawing which forms a part of this specification, and its novel features will be defined in the appended claims.

1n the drawing: Figure 1 is a side elevation of an incandescent lamp embodying the invention, Fig. 2 is a similar view partly in vertical section, Fig. 3 is a side view taken at right angles to the elevation shown in Fig. 1 and with the bulb broken away, Fig. 4 is a vertical section showing the bulb broken to permit the spring-clamping arms to turn on their pivots and disengage the spring fingers which secure the metallic sleeve of the bulb to socket, Fig. 5 is a plan view of the socket, and Fig. 6 is a vertical section of the same.

The .reference numeral 1 designates the glass bulb permanently secured by suitable adhesive material to a metallic cap 2 profvided with diametrically projecting lugs 3 for f the purpose hereinafter explained. The up -pe'r edge of the cap 2 is providedwith bearings 4 at diametrically opposite points for the journals 5 of the clamping arms 6, the upper ends 7 of which are transversely curved to iembrace the opposite sides of the bulb as shown in Figs. 1 and 2. 1

The socket 8 is formed with diametrically Specification of Letters iPatent.

Patented April '7, 1908.

opposite verticallgrooves 9 to receive the lugs 3 of the cap 2, and with diametrically-oppo site housings 1() to accommodate spring iingers 11, formed at their lower ends with flanges 12 to facilitate their attachment to the base 13 of the socket by screws 14. The spring-lingers 11 are formed near their upper ends with inwardly projecting lugs 15 adapted to engage shoulders 16, formed by recessing the opposite sides of the cap 2.

The conductorconnections and the lamp filament are not shown' as they constitute no part of the improvement and will be of the usual form.

The utility and o eration ofthe improvementwill be readi y understood. The insertion of ,the cap 2 into the socket 8 causes lugs 15 of the spring fingers 11 to engage the shoulders 16 of the cap as illustrated in Fig. 2, thus preventing the detachment of the bulb from the socket as'the lugs 3 fitting the grooves 9 prevent the turning of the bulb and cap, and the lugs 15 engaging the shoulders prevent the pulling out'of the bulb. When the filament burns out the bulb is broken at its lower end shownin Fig. 4 permitting the upper ends 7 of the clamping arms 6 to be pressed inward causing theirlower ends to spread apart to discngagc the spring ngers from the cap 2 after which the capmay be readily drawn out of the socket.

Having fully described my invention what I claim as new and desire to secure by Letters Patent, is i 1. The combinationwith an incandescent lamp bulb, of a cap permanently secured thereto, and rovided with diametrically opposits shouh ers, and oppositely projecting ugs, a socket to receive said cap, means for preventingv the turning of the ca within the socket, means within the cap fldr engaging said shoulders and means carried by said cap for disengaging said engaging means.

2. The combination with an incandescent lamp bulb, of cap permanently secured thereto, and. )revided with diametrically op osite shoulders and oppositely projecting ugs, a socket to receive said cap, means for preventing the turning of the ca within the socket, means within the cap or 'engaging said shoulders and means carried by said cap for discngaging said engaging means, coinprising oppositely disposed arms pivoted to said ca 3. T e combination with an incandescent adapted to be forced lamp bulb, of a cap permenenly secured thereto, and rovided with oppositelydisposed lugs, an diametrically opposite shoul ders, clamping arms pivotall f secured te 0pposite sides of said cap, a. sociiet formed with opposite grooves to receive said lugs, and spring fingers secured within said socket and having lugs to engage said shoulders.

4.- he combination with an incandescent of a cap permanently secured provided with oppositely disposed lugs, and diemetrically opposite sl1oulders, clainpin arms pivotallv secured to opposite sides o said cap, a. socket formed with opposite grooves to receive said lugs, and spring lingers secured within said socliet. and having lugs to engage said shoulders, the lower ends of said clamping arms being against said spring linwlien the bulb is ne shoulders o' the esp. 5 The ceinbineticn with an incsndeseen 'sa ingers from lierete end provided with opposicely disposed lugs, end dismrically eppcsit-e ebmilders, clamping arms pivotall r secured o opposite sides of said cap, s soc et formed with opposite grooves to receive seid lugs, end oppositely disposed housings, and spring fingers arranged Within seid housings, and having projeeing lugs, said fingers being secured to tbe base of the socket.

In testimony whereof I affix my signature i the presence o? two witnesses.

FRNZ FRANKUFSK.

lll/'ifm esses.'

J. CLYDE MILLER, j HUGH ELMOTT.

brokenl te disengege 

